USGS Water-Year Summary for Site 13334300

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00048 Pressure, diss gases(Max.,Min.,Mean)
	00060 Discharge(Mean)
	00065 Gage height(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

13334300 SNAKE RIVER NEAR ANATONE, WA

LOCATION - Lat 46°05'50", long 116°58'36" referenced to North American Datum of 1927, in SE 1/4 NE 1/4 sec.12, T.7 N., R.46 E., Asotin County, WA, Hydrologic Unit 17060103, on left bank 1.2 mi downstream from Grande Ronde River, 7.8 mi east of Anatone, 22 mi south of Clarkston, and at mile 167.2.

DRAINAGE AREA - 92,960 mi².

REVISIONS HISTORY - WDR WA-76-1: 1974 and 1975.

SURFACE-WATER RECORDS

PERIOD OF RECORD - July 1958 to current year.

GAGE - Water-stage recorder. Datum of gage is 806.68 ft above NGVD of 1929. Prior to Aug. 3, 2010 previously reported as Datum of gage is 806.78 ft above NGVD.

REMARKS - Diversions upstream from station for irrigation of about 4,090,000 acres, of which about 750,000 acres are irrigated by withdrawals from ground water. Flow regulated by many reservoirs upstream from station with a total usable capacity of more than 10,000,000 acre-ft, the most effective of which is Brownlee Reservoir, 117.8 mi upstream. Diurnal fluctuations caused by Hells Canyon powerplant. U.S. Geological Survey satellite telemeter at station.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 195,000 ft³/s, June 18, 1974, gage height, 24.45 ft; minimum discharge, 6,010 ft³/s, Sept. 2, 1958, gage height, 1.29 ft.

WATER-QUALITY RECORDS

PERIOD OF RECORD - WATER TEMPERATURE: Water years 1973 to May 1984, October 1985 to March 2023. TOTAL DISSOLVED GAS: April 2009 to September 2022 (seasonal records only). Seasonal records from April 2003 to September 2008, available in files of the U.S. Geological Survey Kennewick Field Office (U.S. Army Corps of Engineers Walla Walla has data for April 1999 to September 2002)

PERIOD OF DAILY RECORD - WATER TEMPERATURE: October 1959 to May 1984, April 1986 to March 2023. TOTAL DISSOLVED GAS: April 2009 to September 2022 (seasonal records only).

INSTRUMENTATION - Temperature recorder since October 1959. Total dissolved gas monitor with a 1-hour logging interval since 1999.

REMARKS - Prior to Oct. 1990, temperature records furnished by U.S. Army Corps of Engineers. Prior to Oct. 2003, temperature records were rounded to nearest half degree. The USACE manages spill levels for fish passage to avoid exceeding 120% total dissolved gas (TDG) in project tailraces and 115% TDG in the forebay of the next project downstream consistent with the current percent TDG limits.

EXTREMES FOR PERIOD OF DAILY RECORD -

WATER TEMPERATURE: Maximum, 25.5°C (rounded), Aug. 26, 28, 1991, Aug. 2-4, 1994, Aug. 14, 1998; Minimum, 0.0°C, several days during some winter months.

TOTAL DISSOLVED GAS: Maximum recorded, 112 percent saturation, June 2-3 and 5-7, 2017; Minimum, 96 percent saturation, many days, but may have been higher or lower during periods of missing record.